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Linux/arch/xtensa/platforms/iss/console.c

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  1 /*
  2  * arch/xtensa/platforms/iss/console.c
  3  *
  4  * This file is subject to the terms and conditions of the GNU General Public
  5  * License.  See the file "COPYING" in the main directory of this archive
  6  * for more details.
  7  *
  8  * Copyright (C) 2001-2005 Tensilica Inc.
  9  *   Authors    Christian Zankel, Joe Taylor
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/kernel.h>
 14 #include <linux/sched.h>
 15 #include <linux/console.h>
 16 #include <linux/init.h>
 17 #include <linux/mm.h>
 18 #include <linux/major.h>
 19 #include <linux/param.h>
 20 #include <linux/seq_file.h>
 21 #include <linux/serial.h>
 22 
 23 #include <asm/uaccess.h>
 24 #include <asm/irq.h>
 25 
 26 #include <platform/simcall.h>
 27 
 28 #include <linux/tty.h>
 29 #include <linux/tty_flip.h>
 30 
 31 #ifdef SERIAL_INLINE
 32 #define _INLINE_ inline
 33 #endif
 34 
 35 #define SERIAL_MAX_NUM_LINES 1
 36 #define SERIAL_TIMER_VALUE (HZ / 10)
 37 
 38 static struct tty_driver *serial_driver;
 39 static struct tty_port serial_port;
 40 static struct timer_list serial_timer;
 41 
 42 static DEFINE_SPINLOCK(timer_lock);
 43 
 44 static char *serial_version = "0.1";
 45 static char *serial_name = "ISS serial driver";
 46 
 47 /*
 48  * This routine is called whenever a serial port is opened.  It
 49  * enables interrupts for a serial port, linking in its async structure into
 50  * the IRQ chain.   It also performs the serial-specific
 51  * initialization for the tty structure.
 52  */
 53 
 54 static void rs_poll(unsigned long);
 55 
 56 static int rs_open(struct tty_struct *tty, struct file * filp)
 57 {
 58         tty->port = &serial_port;
 59         spin_lock_bh(&timer_lock);
 60         if (tty->count == 1) {
 61                 setup_timer(&serial_timer, rs_poll,
 62                                 (unsigned long)&serial_port);
 63                 mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
 64         }
 65         spin_unlock_bh(&timer_lock);
 66 
 67         return 0;
 68 }
 69 
 70 
 71 /*
 72  * ------------------------------------------------------------
 73  * iss_serial_close()
 74  *
 75  * This routine is called when the serial port gets closed.  First, we
 76  * wait for the last remaining data to be sent.  Then, we unlink its
 77  * async structure from the interrupt chain if necessary, and we free
 78  * that IRQ if nothing is left in the chain.
 79  * ------------------------------------------------------------
 80  */
 81 static void rs_close(struct tty_struct *tty, struct file * filp)
 82 {
 83         spin_lock_bh(&timer_lock);
 84         if (tty->count == 1)
 85                 del_timer_sync(&serial_timer);
 86         spin_unlock_bh(&timer_lock);
 87 }
 88 
 89 
 90 static int rs_write(struct tty_struct * tty,
 91                     const unsigned char *buf, int count)
 92 {
 93         /* see drivers/char/serialX.c to reference original version */
 94 
 95         simc_write(1, buf, count);
 96         return count;
 97 }
 98 
 99 static void rs_poll(unsigned long priv)
100 {
101         struct tty_port *port = (struct tty_port *)priv;
102         int i = 0;
103         unsigned char c;
104 
105         spin_lock(&timer_lock);
106 
107         while (simc_poll(0)) {
108                 simc_read(0, &c, 1);
109                 tty_insert_flip_char(port, c, TTY_NORMAL);
110                 i++;
111         }
112 
113         if (i)
114                 tty_flip_buffer_push(port);
115 
116 
117         mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
118         spin_unlock(&timer_lock);
119 }
120 
121 
122 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
123 {
124         return rs_write(tty, &ch, 1);
125 }
126 
127 static void rs_flush_chars(struct tty_struct *tty)
128 {
129 }
130 
131 static int rs_write_room(struct tty_struct *tty)
132 {
133         /* Let's say iss can always accept 2K characters.. */
134         return 2 * 1024;
135 }
136 
137 static int rs_chars_in_buffer(struct tty_struct *tty)
138 {
139         /* the iss doesn't buffer characters */
140         return 0;
141 }
142 
143 static void rs_hangup(struct tty_struct *tty)
144 {
145         /* Stub, once again.. */
146 }
147 
148 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
149 {
150         /* Stub, once again.. */
151 }
152 
153 static int rs_proc_show(struct seq_file *m, void *v)
154 {
155         seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
156         return 0;
157 }
158 
159 static int rs_proc_open(struct inode *inode, struct file *file)
160 {
161         return single_open(file, rs_proc_show, NULL);
162 }
163 
164 static const struct file_operations rs_proc_fops = {
165         .owner          = THIS_MODULE,
166         .open           = rs_proc_open,
167         .read           = seq_read,
168         .llseek         = seq_lseek,
169         .release        = single_release,
170 };
171 
172 static const struct tty_operations serial_ops = {
173         .open = rs_open,
174         .close = rs_close,
175         .write = rs_write,
176         .put_char = rs_put_char,
177         .flush_chars = rs_flush_chars,
178         .write_room = rs_write_room,
179         .chars_in_buffer = rs_chars_in_buffer,
180         .hangup = rs_hangup,
181         .wait_until_sent = rs_wait_until_sent,
182         .proc_fops = &rs_proc_fops,
183 };
184 
185 int __init rs_init(void)
186 {
187         tty_port_init(&serial_port);
188 
189         serial_driver = alloc_tty_driver(SERIAL_MAX_NUM_LINES);
190 
191         printk ("%s %s\n", serial_name, serial_version);
192 
193         /* Initialize the tty_driver structure */
194 
195         serial_driver->driver_name = "iss_serial";
196         serial_driver->name = "ttyS";
197         serial_driver->major = TTY_MAJOR;
198         serial_driver->minor_start = 64;
199         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
200         serial_driver->subtype = SERIAL_TYPE_NORMAL;
201         serial_driver->init_termios = tty_std_termios;
202         serial_driver->init_termios.c_cflag =
203                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
204         serial_driver->flags = TTY_DRIVER_REAL_RAW;
205 
206         tty_set_operations(serial_driver, &serial_ops);
207         tty_port_link_device(&serial_port, serial_driver, 0);
208 
209         if (tty_register_driver(serial_driver))
210                 panic("Couldn't register serial driver\n");
211         return 0;
212 }
213 
214 
215 static __exit void rs_exit(void)
216 {
217         int error;
218 
219         if ((error = tty_unregister_driver(serial_driver)))
220                 printk("ISS_SERIAL: failed to unregister serial driver (%d)\n",
221                        error);
222         put_tty_driver(serial_driver);
223         tty_port_destroy(&serial_port);
224 }
225 
226 
227 /* We use `late_initcall' instead of just `__initcall' as a workaround for
228  * the fact that (1) simcons_tty_init can't be called before tty_init,
229  * (2) tty_init is called via `module_init', (3) if statically linked,
230  * module_init == device_init, and (4) there's no ordering of init lists.
231  * We can do this easily because simcons is always statically linked, but
232  * other tty drivers that depend on tty_init and which must use
233  * `module_init' to declare their init routines are likely to be broken.
234  */
235 
236 late_initcall(rs_init);
237 
238 
239 #ifdef CONFIG_SERIAL_CONSOLE
240 
241 static void iss_console_write(struct console *co, const char *s, unsigned count)
242 {
243         int len = strlen(s);
244 
245         if (s != 0 && *s != 0)
246                 simc_write(1, s, count < len ? count : len);
247 }
248 
249 static struct tty_driver* iss_console_device(struct console *c, int *index)
250 {
251         *index = c->index;
252         return serial_driver;
253 }
254 
255 
256 static struct console sercons = {
257         .name = "ttyS",
258         .write = iss_console_write,
259         .device = iss_console_device,
260         .flags = CON_PRINTBUFFER,
261         .index = -1
262 };
263 
264 static int __init iss_console_init(void)
265 {
266         register_console(&sercons);
267         return 0;
268 }
269 
270 console_initcall(iss_console_init);
271 
272 #endif /* CONFIG_SERIAL_CONSOLE */
273 
274 

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